Student Project Figures Figure 18 Two colonies of Botrylloides leachii interacting and forming a bi-partner chimera along their growing edges. (a) Ampullae of two colonies (1 & 2) are seen interacting and the arrows denote the region of contact. Colonies in contact often extend their ampullae towards each other to initiate an interaction. (b-c) The ampullar tips of the opposing colonies are interacting. (d) Megaloampulllae (M) are visible in one of the colonies. These megaloampullae form once contact is established and the ampullae expand in size. Bars = 150 µm. Images adapted from Zaniolo, Manni & Ballarin, 2006.  Figure 18 Figure 19